Siren.



H. 0. HEATH.

amen.

Patented Feb. 10, 1914.

APPLICATION TILED MAR. 24, 1913.

IN VEN TOR.

///7/?I?V 6 flsm/ a I @/9%;VEK

c. HEATH, or she rnancxsoo, cemronlvzn.

SIREN.

Specification of Letters Patent.

Patented Feb. 10, 1914.

Application filed March 24, 1913. Serial No. 756,353.

To all whom it mag concern: I

Be it known that I, HARRY C. HEATH, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented a new and useful Siren, of which the following is a specification in such full and clear terms as will enablethose skilled in the art to constructand' use the same.

This invention relates to a siren for use in connection with automobiles, foghorns, or

in any other place where it is desired to produce a far reaching tone.

An object of the invention is'to provide a siren which will immediately upon the beginning of the blast make as loud a soundas possible, there, being no gradual increasing" and gradual dying away of the sound with this invention as is the case with sirens which start from a condition of rest into motion and then gradually return to rest again, whether operated mechanically or by means of a'blast of air or steam.

I am aware that there are'many modifications of this invention, but one of the embodiments thereof is shown in the drawings in which the same reference numeral is apy plied to the same portion throughout.

Figure l is a side elevation with a por tion of the horn broken away for purposes of illustration, Fig. 2 is afront'elevation of the siren with the horn partly broken away, Fig. 3 is a vertical sectional view of the siren, and Fig. 4 is a front view of the siren with the cover off and portions broken away for purposes of illustration.

The numeral 1 represents a suitable base having a journal bearing 2 and a runner casing 3 at the upper portion thereof. Extending through the journal bearing 2 is a shaft 4, said shaft having a pulley 5 bolted thereon and being suitably secured to the runner 6. The runneris shaped somewhat like a fan with straight air channels 7, there being preferably an odd number of said air channels.

The casing 3 is provided with a series of openings 8, said openings being of substantially the same width as the width of the of the casing,

' lows,

runner. On the front of the casing 3 the-re is a plate 9 having suitable ports 10. This plate is slotted on its upper edge to permit the stem of the knob 11 to pass therethrough and be connected with the shutter 1-2. The shutter 12 fits snugly within the casing 3 and tits closely over the outside of the min Thls shutter has openings 14 and 1.4 y

ner. on the side and edge thereof so that it is possible by' moving the knob 11 in one direction or the other to entirely close the ports of the plate 9, as well as the ports of the casing 3, or in the other position to open them wide.

I prefer to secure the horn 15 on the side lugs 16 thereon being used to secure it to the casing. 9.

In operation the runner is rotated at all times by any suitable means and while so rotated the shutter 12 is opened slightly, the sound proceeding from the siren as soon as the ports are opened a small amount, its

tone being substantially the same at all times although the volume of sound increases.

Having thus described my'invention what I claim as new and desire to secure by Letters Patent -0f the United States,is as folmodifi'cations within the scope of the claims being expressly reserved: v

1. In a siren, the combination of a casing having ports on the side and circumference thereof, a runner revoluble therein, and a shutter for opening and closing said ports, substantially as described.

2. In a siren, acasing having ports on the side and peripherythereof, a revoluble run- .ner therein, a shutter to open and close said ports, and a horn extending away from the side of said casing and into which ports open, substantially as described.

In testimony whereof I have (hereunto set y in the presence of the two subscribed witnesses.

HARRY C. HEATH.

Witnesses:

C. P. GRIFFIN, HENRY G. Lis'ran.

the side e0 hand this 10th day of March A. D. 1913, 

